ThisIsClark

Optimize the code of getting pool status

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**What this PR does / why we need it**: Make the code of getting pool status easier to be understood. **Which issue this PR fixes** *(optional, in `fixes #(, fixes...

/kind improvement **What happened**: The code of getting pool's status is a little bit difficult to understand **What you expected to happen**: The code of getting pool's status should be...

**Is this a BUG REPORT or FEATURE REQUEST?**: Improvement **What happened**: The default limit of volume list and attachment list is 50, but actually it's common to have more than...

**Is this a BUG REPORT or FEATURE REQUEST?**: /kind feature **What happened**: Now, when the pool was deleted in backend, OpenSDS's pool list still display it(with status "unavailable"). In the...

Fix the issue that the function _storage_exist doesn't work

1

**What this PR does / why we need it**: Fix the issue that the function `_storage_exist` return true no matter the storage is exist **Which issue this PR fixes** *(optional,...